IMC 2006 Q15
15. What is the mean of \(1.\dot{2}\) and \(2.\dot{1}\) ?
- A \(1.\dot{6}\)
- B 1.666
- C 1.665
- D \(1.6\dot{5}\)
- E 1.65
Intermediate Mathematical Challenge 2006, Question 15. © UK Mathematics Trust. Original paper on ukmt.org.uk
Answer: A \(1.\dot{6}\)
The mean of \(1.\dot{2}\) and \(2.\dot{1}\) is \((1.\dot{2} + 2.\dot{1}) \div 2 = 3.\dot{3} \div 2 = 1.\dot{6}\).
Solution © UK Mathematics Trust, from the IMC 2006 solutions.